Diesel process was studied and characterized by ultraviolet-visible extinction and scattering spectroscopy. Measurements were performed on an optically accessible diesel engine, realized by modifying a single cylinder, air-cooled, 4-stroke diesel engine by means of an external combustion chamber with three optical accesses: two along the longitudinal direction, for the extinction measurements, and one in that orthogonal, for the scattering measurements. The simultaneous use of broadband extinction and scattering coefficients in this spectral range, permitted the real time evaluation of size, concentration of droplets and soot particles and their optical properties. The optical properties change with the wavelength and so each measurement furnishes independent information on the size distribution of fuel droplets and soot particle inside the combustion chamber with temporal resolution of 0.5 crank angle and spatial resolution of 0.1 x 1 mm². The experimental results were compared with the model simulation based on Mie theory for the fuel droplets and Rayleigh theory for soot particles.
Determination of size of fuel droplets and soot particles in a Diesel engine by broadband extinction and scattering spectroscopy
Merola SS;Vaglieco BM;
2001
Abstract
Diesel process was studied and characterized by ultraviolet-visible extinction and scattering spectroscopy. Measurements were performed on an optically accessible diesel engine, realized by modifying a single cylinder, air-cooled, 4-stroke diesel engine by means of an external combustion chamber with three optical accesses: two along the longitudinal direction, for the extinction measurements, and one in that orthogonal, for the scattering measurements. The simultaneous use of broadband extinction and scattering coefficients in this spectral range, permitted the real time evaluation of size, concentration of droplets and soot particles and their optical properties. The optical properties change with the wavelength and so each measurement furnishes independent information on the size distribution of fuel droplets and soot particle inside the combustion chamber with temporal resolution of 0.5 crank angle and spatial resolution of 0.1 x 1 mm². The experimental results were compared with the model simulation based on Mie theory for the fuel droplets and Rayleigh theory for soot particles.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
